Self-confessed Nasa hacker Gary McKinnon is appealing to outgoing US president George W Bush to halt McKinnon's extradition to the US.

McKinnon's legal team has requested that foreign secretary David Miliband press for a pardon from Bush, McKinnon's solicitor Karen Todner announced at a press conference on Thursday. "We have asked David Miliband to seek consent to ask for a pardon," said Todner.

The solicitor added that McKinnon's defence team had already applied for a pardon from Bush, but had been rejected on the grounds that McKinnon was not a US citizen.

McKinnon is also hopeful that president-elect Barack Obama will drop the extradition after his inauguration on Tuesday 20 January. "A lot of us have looked at Obama as a new hope," McKinnon told the press conference in London.

The US government has accused McKinnon of "the biggest military hack of all time". US prosecutors claim that between 2001 and 2002, McKinnon accessed over 73,000 army, navy, air force and Nasa computers, causing $700,000 (£430,000) damage by deleting files.

McKinnon has admitted hacking US military systems, but denies causing damage. He claims he was initially searching for data about UFOs, and also found evidence of anti-gravity projects.

The appeal to Bush coincides with an attempt by McKinnon to halt his extradition by pleading guilty to UK computer offences. Todner sent a confession signed by McKinnon to director of public prosecutions Keir Starmer on 23 December. In the confession letter McKinnon gave assurances that he would plead guilty to offences under section 2 of the Computer Misuse Act (CMA) in an attempt to secure a UK jail term. Section 2 of the CMA deals with "unauthorised access with intent to commit or facilitate commission of further offences."

McKinnon told ZDNet UK on Thursday he was hopeful Starmer would agree to prosecute in the UK.

Tom is a technology reporter for ZDNet.com, writing about all manner of security and open-source issues.Tom had various jobs after leaving university, including working for a company that hired out computers as props for films and television, and a role turning the entire back catalogue of a publisher into e-books.Tom eventually found tha...
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